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SubjectRe: [PATCH v3 1/2] hwmon: (ltq-cputemp) add cpu temp sensor driver
On Fri, Sep 01, 2017 at 08:58:17AM +0200, Florian Eckert wrote:
> Add the lantiq cpu temperature sensor support for xrx200.
>
> Signed-off-by: Florian Eckert <fe@dev.tdt.de>

Applied to hwmon-next.

Thanks,
Guenter

> ---
> v2:
> - remove default in Makefile
> - fix spelling
> - removing first read delay, because temperature value is not read during boot
> anymore
> - change calculation, compiler should to the optimization
> - remove unnecessary initialization
> - use new devm_hwmon_device_register_with_info API
> - use module_platform_driver function
>
> v3:
> - sort includes in alphabetic order
> - add missing linux/bitops.h include
> - fix alignment
> - fix switch case indentation
> - use octal file permission instead of S_IRUGO
> - set hwmon device name to "ltq_cputemp"
> - enable temperature chip before hwmon registration
> - remove release function registrate ltq_cputemp_disable()
> with devm_add_action
> - remove init_ltq_cputemp and clean_ltq_cputemp not used
> overlooked it on v2
>
> drivers/hwmon/Kconfig | 7 ++
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/ltq-cputemp.c | 163 ++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 171 insertions(+)
> create mode 100644 drivers/hwmon/ltq-cputemp.c
>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 5ef2814345ef..218332f0e913 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -790,6 +790,13 @@ config SENSORS_LTC4261
> This driver can also be built as a module. If so, the module will
> be called ltc4261.
>
> +config SENSORS_LTQ_CPUTEMP
> + bool "Lantiq cpu temperature sensor driver"
> + depends on LANTIQ
> + help
> + If you say yes here you get support for the temperature
> + sensor inside your CPU.
> +
> config SENSORS_MAX1111
> tristate "Maxim MAX1111 Serial 8-bit ADC chip and compatibles"
> depends on SPI_MASTER
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index d4641a9f16c1..c84d9784be98 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -110,6 +110,7 @@ obj-$(CONFIG_SENSORS_LTC4222) += ltc4222.o
> obj-$(CONFIG_SENSORS_LTC4245) += ltc4245.o
> obj-$(CONFIG_SENSORS_LTC4260) += ltc4260.o
> obj-$(CONFIG_SENSORS_LTC4261) += ltc4261.o
> +obj-$(CONFIG_SENSORS_LTQ_CPUTEMP) += ltq-cputemp.o
> obj-$(CONFIG_SENSORS_MAX1111) += max1111.o
> obj-$(CONFIG_SENSORS_MAX16065) += max16065.o
> obj-$(CONFIG_SENSORS_MAX1619) += max1619.o
> diff --git a/drivers/hwmon/ltq-cputemp.c b/drivers/hwmon/ltq-cputemp.c
> new file mode 100644
> index 000000000000..1d33f94594c1
> --- /dev/null
> +++ b/drivers/hwmon/ltq-cputemp.c
> @@ -0,0 +1,163 @@
> +/* Lantiq cpu temperature sensor driver
> + *
> + * Copyright (C) 2017 Florian Eckert <fe@dev.tdt.de>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version
> + *
> + * This program is distributed in the hope that it will be useful
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/delay.h>
> +#include <linux/hwmon.h>
> +#include <linux/hwmon-sysfs.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +
> +#include <lantiq_soc.h>
> +
> +/* gphy1 configuration register contains cpu temperature */
> +#define CGU_GPHY1_CR 0x0040
> +#define CGU_TEMP_PD BIT(19)
> +
> +static void ltq_cputemp_enable(void)
> +{
> + ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) | CGU_TEMP_PD, CGU_GPHY1_CR);
> +}
> +
> +static void ltq_cputemp_disable(void *data)
> +{
> + ltq_cgu_w32(ltq_cgu_r32(CGU_GPHY1_CR) & ~CGU_TEMP_PD, CGU_GPHY1_CR);
> +}
> +
> +static int ltq_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *temp)
> +{
> + int value;
> +
> + switch (attr) {
> + case hwmon_temp_input:
> + /* get the temperature including one decimal place */
> + value = (ltq_cgu_r32(CGU_GPHY1_CR) >> 9) & 0x01FF;
> + value = value * 5;
> + /* range -38 to +154 °C, register value zero is -38.0 °C */
> + value -= 380;
> + /* scale temp to millidegree */
> + value = value * 100;
> + break;
> + default:
> + return -EOPNOTSUPP;
> + }
> +
> + *temp = value;
> + return 0;
> +}
> +
> +static umode_t ltq_is_visible(const void *_data, enum hwmon_sensor_types type,
> + u32 attr, int channel)
> +{
> + if (type != hwmon_temp)
> + return 0;
> +
> + switch (attr) {
> + case hwmon_temp_input:
> + return 0444;
> + default:
> + return 0;
> + }
> +}
> +
> +static const u32 ltq_chip_config[] = {
> + HWMON_C_REGISTER_TZ,
> + 0
> +};
> +
> +static const struct hwmon_channel_info ltq_chip = {
> + .type = hwmon_chip,
> + .config = ltq_chip_config,
> +};
> +
> +static const u32 ltq_temp_config[] = {
> + HWMON_T_INPUT,
> + 0
> +};
> +
> +static const struct hwmon_channel_info ltq_temp = {
> + .type = hwmon_temp,
> + .config = ltq_temp_config,
> +};
> +
> +static const struct hwmon_channel_info *ltq_info[] = {
> + &ltq_chip,
> + &ltq_temp,
> + NULL
> +};
> +
> +static const struct hwmon_ops ltq_hwmon_ops = {
> + .is_visible = ltq_is_visible,
> + .read = ltq_read,
> +};
> +
> +static const struct hwmon_chip_info ltq_chip_info = {
> + .ops = &ltq_hwmon_ops,
> + .info = ltq_info,
> +};
> +
> +static int ltq_cputemp_probe(struct platform_device *pdev)
> +{
> + struct device *hwmon_dev;
> + int err = 0;
> +
> + /* available on vr9 v1.2 SoCs only */
> + if (ltq_soc_type() != SOC_TYPE_VR9_2)
> + return -ENODEV;
> +
> + err = devm_add_action(&pdev->dev, ltq_cputemp_disable, NULL);
> + if (err)
> + return err;
> +
> + ltq_cputemp_enable();
> +
> + hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
> + "ltq_cputemp",
> + NULL,
> + &ltq_chip_info,
> + NULL);
> +
> + if (IS_ERR(hwmon_dev)) {
> + dev_err(&pdev->dev, "Failed to register as hwmon device");
> + return PTR_ERR(hwmon_dev);
> + }
> +
> + return 0;
> +}
> +
> +const struct of_device_id ltq_cputemp_match[] = {
> + { .compatible = "lantiq,cputemp" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, ltq_cputemp_match);
> +
> +static struct platform_driver ltq_cputemp_driver = {
> + .probe = ltq_cputemp_probe,
> + .driver = {
> + .name = "ltq-cputemp",
> + .of_match_table = ltq_cputemp_match,
> + },
> +};
> +
> +module_platform_driver(ltq_cputemp_driver);
> +
> +MODULE_AUTHOR("Florian Eckert <fe@dev.tdt.de>");
> +MODULE_DESCRIPTION("Lantiq cpu temperature sensor driver");
> +MODULE_LICENSE("GPL");
> --
> 2.11.0
>

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